Building balcony

The utility model discloses a building balcony which comprises an upper eave, a left enclosing wall, a right enclosing wall and a cantilever beam, wherein the upper eave is trapezoid; the cantilever beam is trapezoid, and is symmetrical to the upper eave in position; the enclosing wall adopts a polygonal structure; the enclosing walls are connected with the upper eave and the cantilever beam. The cantilever beam is used as a floor of the balcony, and extends out the wall body of the building to form a raised balcony, so that the practical usable building area of a user is increased; the enclosing walls are connected between the upper eave and the cantilever beam, so that the safety of the raised balcony is improved, and the raised balcony is safer relative to the balcony only provided with the upper eave and the cantilever beam; the upper eave is trapezoid, so that the shading area of the upper eave is less, and the day lighting effect of the balcony at a certain time period is improved.